DS80PCI800SQ Datasheet, PDF (34/45 Pages) Texas Instruments – DS80PCI800 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 8 Channel PCI Express Repeater

DS80PCI800
SNLS334E – APRIL 2011 – REVISED MARCH 2012
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Address
0x42
Register Name
CH7 - CHA3
VOD
0x43
CH7 - CHA3
DEM
0x44
CH7 - CHA3
IDLE Threshold
0x51
Device ID
Table 9. SMBUS Slave Mode Register Map (continued)
Bit (s) Field
7
Short Circuit
Protection
6
RATE_SEL
5:3 Reserved
2:0 VOD Control
7
RXDET STATUS
6:5 RATE_DET
STATUS
4:3 Reserved
2:0 DEM Control
7:4 Reserved
3:2 IDLE thd
1:0 IDLE tha
7:5 VERSION
4:0 ID
Type Default
R/W 0xAD
R
0x02
R
R/W
R/W
R/W 0x00
R
0x45
Description
1: Enable the short circuit protection
0: Disable the short circuit protection
1: Gen 1/2,
0: Gen 3
Note: override the RATE pin.
Set bits to default value - 101.
OA3 VOD Control
000: 0.7 V
001: 0.8 V
010: 0.9 V
011: 1.0 V
100: 1.1 V
101: 1.2 V (default)
110: 1.3 V
111: 1.4 V
Observation bit for RXDET CH7 - CHA3.
1: RX = detected
0: RX = not detected
Observation bit for RATE_DET CH7 - CHA3.
00: GEN1 (2.5G)
01: GEN2 (5G)
11: GEN3 (8G)
Set bits to 0.
OA3 DEM Control
000: 0 dB
001: –1.5 dB
010: –3.5 dB (default)
011: –5 dB
100: –6 dB
101: –8 dB
110: –9 dB
111: –12 dB
Set bits to 0.
De-assert threshold
00 = 110 mVp-p (default)
01 = 100 mVp-p
10 = 150 mVp-p
11 = 130 mVp-p
Note: override the SD_TH pin.
Assert threshold
00 = 180 mVp-p (default)
01 = 160 mVp-p
10 = 210 mVp-p
11 = 190 mVp-p
Note: override the SD_TH pin.
010'b
00101'b
Applications Information
GENERAL RECOMMENDATIONS
The DS80PCI800 is a high performance circuit capable of delivering excellent performance. Careful attention
must be paid to the details associated with high-speed design as well as providing a clean power supply. Refer
to the information below and Revision 4 of the LVDS Owner's Manual for more detailed information on high
speed design tips to address signal integrity design issues.
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